Missing exemptions on your property tax bill?

Homeowners: Are you missing exemptions on your property tax bill? How to apply for Certificate(s) of Error

As homeowners in Cook County receive their 2024 Second Installment Tax Bills (tax bill) in the mail, they are encouraged to look at the bottom left corner to ensure that the correct exemption(s) are applied.

If a homeowner believes they are entitled to an exemption that is not reflected on their tax bill, they can apply for what is called a Certificate of Error. The Certificate of Error process provides homeowners with an opportunity to redeem missing exemptions for up to three years in addition to the current tax year. Homeowners can now apply for the 2024, 2023, 2022, and 2021 tax years via our forms available online.

As a reminder, homeowners are responsible for paying the entirety of the tax bill to the Cook County Treasurer’s Office by December 15, 2025. If the Certificate of Error application is granted, either a corrected tax bill or a refund for the difference will be issued.